Public School Funding and Postsecondary Outcomes in Illinois: What is Reasonable to Expect from Illinois’ School Funding Reforms? This paper explores the relationships between differential public school funding across Illinois high schools and six educational outcomes: ACT composite scores, ACT math scores, enrollment in any postsecondary education, enrollment in four-year institutions, attainment of any postsecondary degree, and attainment of four-year degrees. It reviews the Illinois school funding policies that were in place at the time of data collection and their regressive structure. Using a unique longitudinal dataset for the Illinois public high school junior class of 2002, it finds significant and positive relationships between higher public school funding and each of the six postsecondary-related outcomes through both hierarchical linear and logistic regression modeling. These findings highlight how funding policies may have affected educational mobility of Illinois public school students.